Improvement in packings for extension gas-fixtures



W` C. VUSBURGH & C. DAY

Packing for Extension Gas-Fixtures. 'N0.15-3,5o6.

Patented July 28,1874.

UNITED STATES PATENT OFFICEc WILLIAM C. VOSBURGH AND CORNELIUS DAY, OFBROOKLYN, NEW YORK.

IMISROVEMENT IN PACKINGS FOR EXTENSION GAS-FIXTURES.

Specification forming part ofLetters Patent No. 153,506, dated July 28,1874; application filed May 15, 1874.

To all whom it may concern:

Be it known that we, WILLIAM C. Vos- BURGH and CORNELIUS DAY, ofBrooklyn, in the county of Kings and State of New York, have invented anImprovement in Packing for Extension GasFiXtures, of which the followingis a specification:

The moving tube of an extension gas-fixture has usually been made toslide through a packing-gland at the lower end of a stationary tube; butthe packing is liable to become injured, in consequence of the absenceof lubricating material, and from the extensiontube being subject to alateral movement or leverage that loosens the tube by compressing thepacking; hence sometimes the extensiontube moves too easily, and slidesdown by its weight, or the gas escapes; or in other instances thepacking produces too great friction from the lubricating material beingeX- hausted.

Our present invention is made for increasing the durability of thepacking-gland, and rendering the friction thereof more uniform.

We make use of a double packing-gland,.

and an intermediate receptacle for lubricating material. By this devicethe metal portions above and below the packings become guides to preventthe packing being injured by lateral pressure due to the leverage of theextenin this cap a is a central hole, through which the extension-tube dpasses freely. The cylinder e is screwed upon this cap a., and containstwo annular diaphragms, f and g, and at the bottom is the screw-cap h.The packings are introduced at i z', and between the diaphragms f g thespace Z is left for lubricating material.

It is generally best to remove the caps a and h, apply the packing offibrous material, and screw on said caps a and h at the ends of thecylinder e, and then pour into the space l bees.- wax and tallow orother lubricating material, and close the orifice by the screw-plug a,after which the double packing-glands, formed as aforesaid, may bescrewed upon the pipe b, and -covered more or less by the ornamentalshell shown by dotted lines at 1,- but we do not limit ourselves to theorder named in which the parts are put together.

- We claim as our invention- The cylinder e, having internalscrew-threads at both ends, and the ri ng-diaphragms f g within it,inclosing the lubricating-chamber l, and with a screw-cap, a, at one endattached to the gas-pipe, and securing the elastic packing, and the caph screwed into the other end, and retaining the second elastic packing,1n combination with the plug u at one side of the lubricating-chamber,for the purposes and as set forth.

Signed by us this 13th day of May, A. D. 1874.

W.C. VOSBURGH. CORNELIUS DAY.

Witnesses GEO. T. PINGKNEY, CEAS. H. SMTTH.

